21516231601604 has 12 divisors (see below), whose sum is σ = 37653477022224. Its totient is φ = 10758095309544.

The previous prime is 21516231601597. The next prime is 21516231601637. The reversal of 21516231601604 is 40610613261512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2624942 + ... + 7065605.

It is an arithmetic number, because the mean of its divisors is an integer number (3137789751852).

Almost surely, 2^{21516231601604} is an apocalyptic number.

It is an amenable number.

21516231601604 is a deficient number, since it is larger than the sum of its proper divisors (16137245420620).

21516231601604 is a wasteful number, since it uses less digits than its factorization.

21516231601604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10245634 (or 10245632 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 21516231601604 in words is "twenty-one trillion, five hundred sixteen billion, two hundred thirty-one million, six hundred one thousand, six hundred four".